How To Upload File In Magento

if (isset($_FILES['logo']['name']) && $_FILES['logo']['name'] != '') {
    try {
        $uploader = new Varien_File_Uploader('logo');
        $uploader->setAllowedExtensions(array('jpg','jpeg','gif','png'));
        $uploader->setAllowRenameFiles(false);
        $uploader->setFilesDispersion(false);
        $path = Mage::getBaseDir('media') . DS;
        // $path = Mage::getBaseDir('media') . DS . 'logo' . DS;
        $logoName = $_FILES['logo']['name'];
        $uploader->save($path, $logoName);
  
    } catch (Exception $e) {
  
    }
}